Currently you can only search on Product, Title and Version. It would be more useful to be able to search on all (or most metadata fields) in a content spec to help the user find the specific content spec that they are looking for.
Added in 1.2-SNAPSHOT. I haven't exposed all of the MetaData fields but I've expanded it a lot more than what was previously available. The new fields are: contentSpecSubtitle contentSpecEdition contentSpecBookVersion contentSpecType contentSpecPubsnumber contentSpecAbstract contentSpecBrand contentSpecCopyrightHolder contentSpecCopyrightYear contentSpecPublicanCfg contentSpecDTD So basically the only ones that aren't included are the bug related metadata.